This is the gateway arch in Honalulu, Hawaii. The Chinatown there is famous, rated a must-see in the tourist guides. The roof is green -- Honalulu is no longer a national capital. The arch makes a nice door-like feature over the sidewalk crossing over a river on the edge of chinatown, which is visible in the background.
This is the Mexico City Royal Arch -- note the gold roof. It was inaugerated in 2008.